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Vacuum high-pressure casting method

A high-pressure casting and vacuum technology, which is applied in the field of vacuum high-pressure casting technology, can solve the problems of reducing the process quality and mechanical properties of castings, and achieve the effects of eliminating solidification shrinkage defects, shrinkage cavity and loose defects, and good feeding

Inactive Publication Date: 2010-12-29
重庆硕龙科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the center casting process fills the rim at the end, resulting in forming defects such as oxide slag, cold shut, and flow marks concentrated on the rim, which reduces the process quality and mechanical properties of the casting

Method used

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment do further description:

[0023] The embodiment takes the vacuum die-casting process of a motorcycle hub as an example. The process adopts vertical parting, annular tangential vacuum filling, and central pressure supplementation. The process is as follows:

[0024] 1. Vacuum high-pressure filling: the alloy melt (4) is quantitatively injected into the pressure chamber (2) through the sprue (1), and the extrusion head (3) moves forward to close the sprue (1) to form a closed cavity and then vacuumize; The head (3) continues to move forward to complete the filling of the rim, spokes and wheel center in sequence, and completes the vacuuming before the filling is completed; see the filling process Figure 4 .

[0025] 2. Pressurized solidification: After the mold filling is completed, the pressure head (3) and the pressure filling head (6) are pressurized and maintained together, so that the alloy melt (4) in t...

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Abstract

The invention relates to a vacuum high-pressure casting process method for a wheel disc casting. The method comprises the following steps of: after melt casting is finished, sequentially and centripetally filling a model from a wheel flange to a wheel center through a broken ring-shaped runner and a tangential ingate with the assistance of vacuum; and after model filling is finished, jointly pressurizing by a pressure head and a pressure filling head which is positioned on an epitaxial slag ladle of the wheel center and maintaining the pressure till a casting is fully solidified to obtain a high-quality wheel disc casting which has the advantages of high-quality wheel flange model filling and no solidification contraction and blowhole defect on a wheel flange hot spot and a wheel center hot spot.

Description

technical field [0001] The invention relates to a vacuum high-pressure casting process for producing wheel-like castings (such as motorcycle and electric power-assisted wheel hubs, pulleys, gears, etc.) with hot spots scattered on the rim and the center of the wheel. technical background [0002] Traditional wheel castings, especially wheel hubs, pulleys, etc., are all made of metal gravity casting, which has problems such as low melt yield, low production efficiency, and low yield. In order to meet the requirements of mass production and improve the yield, production efficiency and yield, a large number of light alloy wheel castings are now produced by high pressure casting. [0003] At present, the high-pressure casting of roulette castings all adopts the center pouring process (see attached figure 1 ). Since the hot spots of this type of casting are distributed on the rim and the wheel center, the indenter can only provide effective feeding for the hot spots of the whee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00
Inventor 龙思远徐绍勇刘伟召
Owner 重庆硕龙科技有限公司
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